Copper isotopic composition of the silicate Earth
文献类型：期刊论文
| 作者 | Liu, Sheng-Ao1; Huang, Jian2; Liu, Jingao3; Woerner, Gerhard4; Yang, Wei5; Tang, Yan-Jie5; Chen, Yi5; Tang, Limei6; Zheng, Jianping7; Li, Shuguang1,2 |
| 刊名 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 出版日期 | 2015-10-01 |
| 卷号 | 427页码:95-103 |
| 关键词 | copper isotopes isotope fractionation peridotite basalt silicate Earth |
| DOI | 10.1016/j.epsl.2015.06.061 |
| 文献子类 | Article |
| 英文摘要 | Copper isotopes have been successfully applied to many fields in geochemistry, and in particular, as a strongly chalcophile element, the isotope systematics of Cu can be potentially applied as a proxy for crust-mantle and core-mantle differentiation processes. However, to date, the Cu isotopic composition of distinct silicate reservoirs in the Earth, as well as the behaviour of Cu isotopes during igneous processes and slab dehydration are not well constrained. To address these issues, here we report high-precision (+/-0.05 parts per thousand; 2SD) Cu isotope data for 132 terrestrial samples including 28 cratonic peridotites, 19 orogenic peridotites, 70 basalts (MORBs, OIBs, arc basalts and continental basalts) and 15 subduction-related andesites/dacites sourced worldwide. The peridotites are classified into metasomatized and non-metasomatized groups, based upon their rare earth element (REE) patterns and the presence or lack of minerals diagnostic of metasomatism (e.g., phlogopite). The metasomatized peridotites span a wide range of delta Cu-65 values from -0.64 to +1.82 parts per thousand, in sharp contrast to the non-metasomatized peridotites that exhibit a narrow range of delta Cu-65 from -0.15 to +0.18 parts per thousand with an average of +0.03 +/- 0.24 parts per thousand (2SD). Comparison between these two groups of peridotites demonstrates that metasomatism significantly fractionates Cu isotopes with sulfide breakdown and precipitation potentially shifting Cu isotopes towards light and heavy values, respectively. MORBs and OIBs have homogeneous Cu isotopic compositions (+0.09 +/- 0.13 parts per thousand; 2SD), which are indistinguishable from those of the non-metasomatized peridotites within uncertainty. This suggests that Cu isotope fractionation during mantle partial melting is limited, even if sulfides are a residual phase. Compared with MORBs and OIBs, arc and continental basalts are more heterogeneous in Cu isotopic composition. In particular, basalts that were collected from a traverse across the Kamchatka arc over a distance of 200 to 400 km from the trench show a large range of delta Cu-65 from -0.19 to +0.47 parts per thousand, and samples with higher Ba/Nb ratios tend to be isotopically more heterogeneous. The large Cu isotopic variations in arc and continental basalts most probably reflect the involvement of recycling crustal materials in their sources. Collectively, the dataset obtained in this study suggests that the bulk silicate Earth (BSE) has an average delta Cu-65 value of +0.06 +/- 0.20 parts per thousand (2SD). (C) 2015 Elsevier B.V. All rights reserved. |
| WOS关键词 | NORTH CHINA CRATON ; SOURCE-MASS-SPECTROMETRY ; SPINEL PERIDOTITE XENOLITHS ; OCEAN ISLAND BASALTS ; SULU UHP TERRANE ; MC-ICP-MS ; GARNET PERIDOTITES ; MELT PERCOLATION ; SE AUSTRALIA ; MANTLE |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000359330800011 |
| 资助机构 | National Natural Foundation of China(41473017) ; National Natural Foundation of China(41473017) ; National Key Basic Research Program of China(2015CB755905) ; National Key Basic Research Program of China(2015CB755905) ; fundamental research funds(2-9-2014-068) ; fundamental research funds(2-9-2014-068) ; National Natural Foundation of China(41473017) ; National Natural Foundation of China(41473017) ; National Key Basic Research Program of China(2015CB755905) ; National Key Basic Research Program of China(2015CB755905) ; fundamental research funds(2-9-2014-068) ; fundamental research funds(2-9-2014-068) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62284]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 作者单位 | 1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China 2.Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China 3.Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada 4.Geowissensch Zentrum Gotingen, Abt Geochem, D-37077 Gottingen, Germany 5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 10029, Peoples R China 6.SOA, Inst Oceanog 2, Hangzhou, Zhejiang, Peoples R China 7.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Sch Earth Sci, Wuhan 430074, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Sheng-Ao,Huang, Jian,Liu, Jingao,et al. Copper isotopic composition of the silicate Earth[J]. EARTH AND PLANETARY SCIENCE LETTERS,2015,427:95-103. |
| APA | Liu, Sheng-Ao.,Huang, Jian.,Liu, Jingao.,Woerner, Gerhard.,Yang, Wei.,...&Li, Shuguang.(2015).Copper isotopic composition of the silicate Earth.EARTH AND PLANETARY SCIENCE LETTERS,427,95-103. |
| MLA | Liu, Sheng-Ao,et al."Copper isotopic composition of the silicate Earth".EARTH AND PLANETARY SCIENCE LETTERS 427(2015):95-103. |
入库方式： OAI收割
来源：地质与地球物理研究所
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